Why a Giant Machine Is Digging a Tunnel Under D.C. | National Geographic

A colossal machine called the “Lady Bird“ is boring a huge tunnel under Washington, D.C., to channel storm water for treatment, keeping runoff out of the city’s notoriously polluted rivers. The $30 million machine is named for Lady Bird Johnson, who, as First Lady of the United States, had advocated for cleaner rivers around the nation’s capital. ➡ Subscribe: About National Geographic: National Geographic is the world’s premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what’s possible. Get More National Geographic: Official Site: Facebook: Twitter: Instagram: